1 // SPDX-License-Identifier: GPL-2.0-only
38 static uint8_t oxnas_nand_read_byte(struct nand_chip *chip)  in oxnas_nand_read_byte()  argument
40 	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);  in oxnas_nand_read_byte()
42 	return readb(oxnas->io_base);  in oxnas_nand_read_byte()
45 static void oxnas_nand_read_buf(struct nand_chip *chip, u8 *buf, int len)  in oxnas_nand_read_buf()  argument
47 	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);  in oxnas_nand_read_buf()
49 	ioread8_rep(oxnas->io_base, buf, len);  in oxnas_nand_read_buf()
52 static void oxnas_nand_write_buf(struct nand_chip *chip, const u8 *buf,  in oxnas_nand_write_buf()  argument
55 	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);  in oxnas_nand_write_buf()
57 	iowrite8_rep(oxnas->io_base, buf, len);  in oxnas_nand_write_buf()
60 /* Single CS command control */
61 static void oxnas_nand_cmd_ctrl(struct nand_chip *chip, int cmd,  in oxnas_nand_cmd_ctrl()  argument
64 	struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);  in oxnas_nand_cmd_ctrl()
67 		writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_CLE);  in oxnas_nand_cmd_ctrl()
69 		writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_ALE);  in oxnas_nand_cmd_ctrl()
77 	struct device_node *np = pdev->dev.of_node;  in oxnas_nand_probe()
80 	struct nand_chip *chip;  in oxnas_nand_probe()  local
88 	oxnas = devm_kzalloc(&pdev->dev, sizeof(*oxnas),  in oxnas_nand_probe()
91 		return -ENOMEM;  in oxnas_nand_probe()
93 	nand_controller_init(&oxnas->base);  in oxnas_nand_probe()
96 	oxnas->io_base = devm_ioremap_resource(&pdev->dev, res);  in oxnas_nand_probe()
97 	if (IS_ERR(oxnas->io_base))  in oxnas_nand_probe()
98 		return PTR_ERR(oxnas->io_base);  in oxnas_nand_probe()
100 	oxnas->clk = devm_clk_get(&pdev->dev, NULL);  in oxnas_nand_probe()
101 	if (IS_ERR(oxnas->clk))  in oxnas_nand_probe()
102 		oxnas->clk = NULL;  in oxnas_nand_probe()
104 	/* Only a single chip node is supported */  in oxnas_nand_probe()
107 		return -EINVAL;  in oxnas_nand_probe()
109 	err = clk_prepare_enable(oxnas->clk);  in oxnas_nand_probe()
113 	device_reset_optional(&pdev->dev);  in oxnas_nand_probe()
116 		chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),  in oxnas_nand_probe()
118 		if (!chip) {  in oxnas_nand_probe()
119 			err = -ENOMEM;  in oxnas_nand_probe()
123 		chip->controller = &oxnas->base;  in oxnas_nand_probe()
125 		nand_set_flash_node(chip, nand_np);  in oxnas_nand_probe()
126 		nand_set_controller_data(chip, oxnas);  in oxnas_nand_probe()
128 		mtd = nand_to_mtd(chip);  in oxnas_nand_probe()
129 		mtd->dev.parent = &pdev->dev;  in oxnas_nand_probe()
130 		mtd->priv = chip;  in oxnas_nand_probe()
132 		chip->legacy.cmd_ctrl = oxnas_nand_cmd_ctrl;  in oxnas_nand_probe()
133 		chip->legacy.read_buf = oxnas_nand_read_buf;  in oxnas_nand_probe()
134 		chip->legacy.read_byte = oxnas_nand_read_byte;  in oxnas_nand_probe()
135 		chip->legacy.write_buf = oxnas_nand_write_buf;  in oxnas_nand_probe()
136 		chip->legacy.chip_delay = 30;  in oxnas_nand_probe()
139 		err = nand_scan(chip, 1);  in oxnas_nand_probe()
147 		oxnas->chips[oxnas->nchips++] = chip;  in oxnas_nand_probe()
151 	if (!oxnas->nchips) {  in oxnas_nand_probe()
152 		err = -ENODEV;  in oxnas_nand_probe()
161 	nand_cleanup(chip);  in oxnas_nand_probe()
165 	for (i = 0; i < oxnas->nchips; i++) {  in oxnas_nand_probe()
166 		chip = oxnas->chips[i];  in oxnas_nand_probe()
167 		WARN_ON(mtd_device_unregister(nand_to_mtd(chip)));  in oxnas_nand_probe()
168 		nand_cleanup(chip);  in oxnas_nand_probe()
172 	clk_disable_unprepare(oxnas->clk);  in oxnas_nand_probe()
179 	struct nand_chip *chip;  in oxnas_nand_remove()  local
182 	for (i = 0; i < oxnas->nchips; i++) {  in oxnas_nand_remove()
183 		chip = oxnas->chips[i];  in oxnas_nand_remove()
184 		WARN_ON(mtd_device_unregister(nand_to_mtd(chip)));  in oxnas_nand_remove()
185 		nand_cleanup(chip);  in oxnas_nand_remove()
188 	clk_disable_unprepare(oxnas->clk);  in oxnas_nand_remove()
194 	{ .compatible = "oxsemi,ox820-nand" },